SIP intermittent one-way speech on CME

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Jul 16th, 2008
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Hi All,


We have a problem with our IP telephone system. We have a Cisco CME and mixture of Cisco and SIP Snom phones. Our problem is that when we make a call (outside calls) from any of our SIP phones, we receiving party can't hear us but we can hear them. We don't have this problem with the Cisco phones.


Any Idea what the problem is?

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paolo bevilacqua Wed, 07/16/2008 - 01:56
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Do you have nat or fw between the sip phones and cme ?

emmanuel.shoroma Wed, 07/16/2008 - 02:05
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There is not NAT or Firewall. The IP phones and the CME are on the same VLAN. The other thing is that the system can work perfect for may be a week or so and then the problem starts again.


Also, I don't have QoS running on my LAN. Can that cause a peoblem?

paolo bevilacqua Wed, 07/16/2008 - 03:07
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QoS has nothing to do with that.


Which exact IOS are you using ?

emmanuel.shoroma Wed, 07/16/2008 - 09:18
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Cisco IOS Software, 3800 Software (C3825-IPVOICEK9-M), Version 12.4(15)T1, RELEASE SOFTWARE (fc2)

paolo bevilacqua Wed, 07/16/2008 - 09:42
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Hi, recommend you switch to 12.4(11)XJ4 and try again.

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